Aspire r14 screen brightness can't be adjusted

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sjcea
sjcea Member Posts: 1 New User

Hi. I just got my laptop for about 3 months. I haven't installed much apps yet. But since yesterday I noticed that my screen brightness can not be adjusted.

 

When I use the shortcut Fn + left arrow/right arrow it alternates between two levels but it does not change anything. I have also tried to change it in different settings like in power options and etc. I noticed that in the PC settings, the screen has this lock icon. I don't know how to unlock it. 

 

laszdn.png

 

please help me should I install a driver or something? 

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